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The overall ratings of five Energy Services stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Bristow Group‘s (NYSE:BRS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Bristow Group provides helicopter services to the worldwide offshore energy industry. In Portfolio Grader’s specific subcategories of Cash Flow and Margin Growth, BRS also gets F’s. The stock’s trailing PE Ratio is 27.60. For a full analysis of BRS stock, visit Portfolio Grader.

Matrix Service (NASDAQ:MTRX) earns a D this week, moving down from last week’s grade of C. Matrix Service provides specialized on-site maintenance and construction services for petroleum refining and storage facilities, as well as water storage facilities for the private industry sector. The stock also gets an F in Earnings Growth. Shares of the company have declined 12.2% from a month ago. This is worse than the Nasdaq’s 1.9% for the same period. To get an in-depth look at MTRX, get Portfolio Grader’s complete analysis of MTRX stock.

Basic Energy Services‘s (NYSE:BAS) rating falls this week to a F (“strong sell”), down from last week’s D (“sell”). Basic Energy Services provides oil and gas drilling and production companies with a range of well site services. The stock gets F’s in Earnings Momentum and Earnings Revisions. As of Oct. 4, 2012, 22.5% of outstanding Basic Energy Services shares were held short. For a full analysis of BAS stock, visit Portfolio Grader.

Key Energy Services (NYSE:KEG) earns a F this week, falling from last week’s grade of D. Key Energy Services provides onshore, rig-based well services, including well maintenance, workover, completion and re-completion, and plugging and abandonment. In Earnings Momentum, Earnings Revisions, Earnings Surprise, and Cash Flow the stock gets F’s. The stock price has dropped 12.6% over the past month. For more information, get Portfolio Grader’s complete analysis of KEG stock.

Cal Dive‘s (NYSE:DVR) rating weakens this week, dropping to a F versus last week’s D. Cal Dive is a marine contracting company that provides manned diving, pipelay and pipe burial, platform installation, and platform salvage services to the offshore oil and natural gas industry. The stock gets F’s in Earnings Momentum, Earnings Revisions, Equity, and Cash Flow. Share prices fell 11.4% over the past month. As of Oct. 4, 2012, 15% of outstanding Cal Dive shares were held short. To get an in-depth look at DVR, get Portfolio Grader’s complete analysis of DVR stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.